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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83632d9740b92762c6733f6490442d618ea6b339c51ca2634ddb5ce00dbd576a' 
  AND token = 'gouYeDrDevXwiT/XwLUFlSBxn7n423FC82mwbNxBa0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}